Fuel cell system and fuel cell vehicle

Abstract

There is disclosed a fuel cell system having a motor which can be driven and generate a regenerative power by receiving the supply of a power, wherein an influence on power supply control is decreased. The fuel cell system fuel cell system comprises a fuel cell which generates a power by an electrochemical reaction of a fuel gas and an oxidant gas; a motor which can be driven and generate the regenerative power by receiving the supply of a power; an inverter which converts a direct-current power output from the fuel cell into an alternate-current power to supply the power to the motor, thereby controlling the driving of the motor; a battery which is connected to the motor in parallel with the fuel cell, and which can be charged with the power generated by the fuel cell and the regenerative power generated by the motor and which can discharge the charged powers to the motor; a rotation number detector which detects the rotation number of the motor; and a control unit which determines whether or not to allow the stop of the control by the inverter with respect to the motor based on the present rotation number of the motor. The control unit compares the present rotation number of the motor with a threshold value which varies in accordance with operation modes of the fuel cell, to perform the determination.

Description

TECHNICAL FIELD[0001]The present invention relates to a fuel cell system and a fuel cell vehicle comprising this system. More particularly, it relates to control by an inverter with respect to a motor which can be driven and generate a regenerative power by receiving the supply of a power in a fuel cell system.BACKGROUND ART[0002]In recent years, much attention has been paid to a fuel cell system in which a fuel cell for generating a power by an electrochemical reaction of a fuel gas and an oxidant gas is used as an energy source. The fuel cell system supplies the fuel gas having a high pressure from a fuel tank to an anode of the fuel cell, and pressurizes and supplies air as the oxidant gas to a cathode thereof, to cause the electrochemical reaction of the fuel gas and the oxidant gas, thereby generating an electromotive force. The development of a vehicle in which such a fuel cell system is mounted has also proceeded. The fuel cell system to be mounted in the vehicle is constitut...

AI Technical Summary

Benefits of technology

[0016]According to the present invention, the generation of a back electromotive voltage in excess of the maximum output voltage of the fuel cell or overcharge into the power storage can be suppressed, whereby the influence on the power supply control in the fuel cell system can be decreased. Therefore, an electric vehicle in which such a fuel cell system is mounted can run under stable power supply control.

Problems solved by technology

However, when the rotation number of the motor is large and the shift position enters the “N” range, an excessively large back electromotive voltage is generated, and an overvoltage is applied to the battery and a converter, which might deteriorate durability.

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